I'm crossing my fingers that some of your first name picks may also get used as middles. You have so many beauties, one can only hope you'll have an enormous family!

Favorites:
Hespera LOVE
Belphoebe LOVE
Illyria LOVE
Everild LOVE
Niniane "Nih-nee-ah-nee" (This one's grown on me. The more I say it to myself the more I enjoy those repeated sounds, the bounciness of it)

Others:Altalune- YESCeridwen- I don't like the emphasis on "rid"
Eilonwy- Beautiful, though it does contain the word "ennui"
Elbereth- sounds lispy to me
Evelake- YES
Finvola- can't get past the "vola." I think of voles, or some kind of Finnish olive-oil substitute.Genoveva- Much prefer Genevieve or Guinevere or Ginevra, but these are probably too mainstream for you.
Lorien- YES
Myristica- Makes me want to slit my wristicas. Sorry! I mean it's better than Nutmeg.
Nienna- Niniane is better imoRhiannon- Strong. I have a bad association with Rhiannon, so I can't be sure.
Seawillow- I really like it in theory, but part of me keeps hearing "Seabiscuit."
Tinuviel- YES
Winterose (one or two r's?)- Maybe Winterrose? Maybe one of the nameberry linguists will know. Lovely, but I like it as a middle name.

Not wild about:
Moonbeam (too much of a straightforward hippy name imo)
Evenstar: Prefer Everild, Evelake
Fairlight: Prefer Fairly, or Fflur ("fleer")
Tinkersnow: What is Tinkersnow? When it snows pots and teakettles? I think this name is adorable but also plum crazy!)Pelagia: I hope this one's after the jellyfish or the moth, because the saints met terrible ends. Somehow I hear "Bellagio," as in the tacky hotel in Vegas... Dunno, just nms.Tempest: Love the play, and the idea of this name; just not sure about the "pest" partLudmila: This one falls into the Brunhilde category for me- suggests a buxom, braided soprano.
Shalott: While I love the tale, I think "Shalott" itself sounds a lot like shallot, or slot, or schlep, shlump, shlemiel....